Federal health officials are warning Americans to avoid sunscreens marketed in whipped, mousse and foam because they aren't approved as effective methods for applying the product.

The Food and Drug Administration (FDA) has sent warning letters to several companies – including Supergoop – over sunscreen products sold in whipped, mousse and foam forms. According to the agency, these products are labeled and marketed as drugs but have not been FDA-approved in those forms.

FOX Business reached out to Supergoop for comment.

The FDA says the products are misbranded because they do not meet the marketing requirements outlined in the agency’s rulebook for over-the-counter drugs. Selling misbranded drugs, the agency warns, is illegal under federal law.

The FDA regulates sunscreens as over-the

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